For what it is worth, I have bought nylon strainer bags (but have yet to use them).
I use pellet hops in the BK. Even add pellet hops for aroma when the temp drops below flash point (<180F) and let it steep for 30-45 minutes during chilling with the IC.
No whole hops are used.
I do 10 gallon batches and note that it drops quite clear during that time.
The first 5 gallons that go into the fermentation bucket is crystal clear (no trub, no hops).
The second 5 gallons that go into the second fermentation bucket is clear for the first 4 gallons and then it comes time to decide whether I want to stop there or try to strain out the last gallon of wort. Being the ever-so-frugal kind-of-guy, I can't seem to help myself from straining the rest of the wort out from the break material and hops. I use an 8-inch SS china cap buillion strainer (extra fine SS mesh)--almost the same result as a fine nylon mesh bag (though I think the nylon mesh is even more fine than the SS strainer). I would recommend the bag versus the 4 inch diameter disc that sits in the large funnels you can buy at the LHBS. Simply for the reason that there is more surface area to prevent clogging.